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Fig. 4B. —Parotid gland metastatic squamous cell carcinoma with false-negative findings in 64-year-old woman. Unenhanced spin-echo T1-weighted MR image (800/13; 2 excitations) show mass (arrows) with well-defined margins. On magnetization transfer images (not shown), tumor had lesion-to-muscle magnetization transfer ratio of 1.02, which exceeded threshold. Tumor was incorrectly diagnosed as benign using combined criteria. Metastatic squamous cell carcinoma in parotid node was identified at surgical resection.